syzbot

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BUG: KMSAN: uninit-value in can_receive+0x12c/0x4a0 net/can/af_can.c:656
 can_receive+0x12c/0x4a0 net/can/af_can.c:656
 canfd_rcv+0x1ff/0x3b0 net/can/af_can.c:705
 __netif_receive_skb_one_core net/core/dev.c:6139 [inline]
 __netif_receive_skb+0x477/0xac0 net/core/dev.c:6252
 process_backlog+0x47c/0x9f0 net/core/dev.c:6604
 __napi_poll+0xd8/0x880 net/core/dev.c:7668
 napi_poll net/core/dev.c:7731 [inline]
 net_rx_action+0xa3f/0x1c90 net/core/dev.c:7883
 handle_softirqs+0x169/0x6e0 kernel/softirq.c:622
 __do_softirq+0x14/0x1b kernel/softirq.c:656
 do_softirq+0x58/0x90 kernel/softirq.c:523
 __local_bh_enable_ip+0xa1/0xb0 kernel/softirq.c:450
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:936 [inline]
 __dev_queue_xmit+0x3bb4/0x58e0 net/core/dev.c:4846
 dev_queue_xmit include/linux/netdevice.h:3381 [inline]
 can_send+0xffa/0x1390 net/can/af_can.c:279
 bcm_can_tx+0x97d/0xd90 net/can/bcm.c:326
 bcm_tx_setup+0x17dc/0x2b70 net/can/bcm.c:1092
 bcm_sendmsg+0x568/0xda0 net/can/bcm.c:1423
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x333/0x3d0 net/socket.c:742
 ____sys_sendmsg+0x7f5/0xcf0 net/socket.c:2592
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2681
 x64_sys_call+0x1c60/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4960 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 __do_kmalloc_node mm/slub.c:5656 [inline]
 __kmalloc_node_track_caller_noprof+0xb77/0x1c90 mm/slub.c:5764
 kmalloc_reserve+0x22f/0x4b0 net/core/skbuff.c:608
 pskb_expand_head+0x1fc/0x15d0 net/core/skbuff.c:2282
 netif_skb_check_for_xdp net/core/dev.c:5497 [inline]
 netif_receive_generic_xdp net/core/dev.c:5528 [inline]
 do_xdp_generic+0xa79/0x1690 net/core/dev.c:5596
 __netif_receive_skb_core+0x1b1d/0x4d10 net/core/dev.c:5949
 __netif_receive_skb_one_core net/core/dev.c:6137 [inline]
 __netif_receive_skb+0xcc/0xac0 net/core/dev.c:6252
 process_backlog+0x47c/0x9f0 net/core/dev.c:6604
 __napi_poll+0xd8/0x880 net/core/dev.c:7668
 napi_poll net/core/dev.c:7731 [inline]
 net_rx_action+0xa3f/0x1c90 net/core/dev.c:7883
 handle_softirqs+0x169/0x6e0 kernel/softirq.c:622
 __do_softirq+0x14/0x1b kernel/softirq.c:656

CPU: 0 UID: 0 PID: 21842 Comm: syz.4.4978 Tainted: G             L      syzkaller #0 PREEMPT(none) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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